- (fl. 1268), eulogist
- LLYN, WILIAM - see LLŶN, WILIAM
- LLYN, WILLIAM - see LLŶN, WILIAM
- LLYWARCH ap BRAN (fl. c. 1137), founder of one of the 'Fifteen (Noble) Tribes of Gwynedd'
- LLYWARCH ap LLYWELYN (fl. 1173-1220) Gwynedd, court-poet
- LLYWARCH HEN (fl. 6th century), British prince and a hero of a cycle of Welsh tales dating from the mid-9th century
- LLYWARCH LLAETY (fl. c. 1140-1160), one of the poets of the period of the Welsh Princes
- LLYWARCH Y NAM - see LLYWARCH LLAETY
- LLYWELYN ab EDNYFED (fl. c. 1400-1460?), poet
- LLYWELYN ab OWAIN ap CYNFRIG MOEL (fl. c. 1480?), poet
- LLYWELYN ap CYNFRIG DDU (fl. c. 1460-1500?), poet
- LLYWELYN ap GRUFFUDD - see LLYWELYN ap GRUFFYDD
- LLYWELYN ap GRUFFYDD (d. 1282), Prince of Wales
- LLYWELYN ap GRUFFYDD (d. 1317), nobleman, soldier and rebel martyr
- LLYWELYN ap GUTUN (fl. c. 1480), poet
- LLYWELYN ap GUTUN ap IEUAN LYDAN - see LLYWELYN ap GUTUN
- LLYWELYN ap GWILYM ap RHYS (fl. 16th century), poet
- LLYWELYN ap HYWEL ap IEUAN ap GRONW (fl. c. 1480?), poet
- LLYWELYN ap IORWERTH (fl. 1173-1240), prince
- LLYWELYN ap MAREDUDD ab EDNYFED - see LLYWELYN ab EDNYFED
- LLYWELYN ap MOEL Y PANTRI (d. 1440) Llanwnnog, poet
- LLYWELYN ap RHISIART - see LEWYS MORGANNWG
- LLYWELYN ap SEISYLL (d. 1023), king of Deheubarth and Gwynedd
- LLYWELYN BREN - see LLYWELYN ap GRUFFYDD
- LLYWELYN BRYDYDD HODDNANT (fl. c. 1300-1350), poet
- LLYWELYN DDU ab Y PASTARD (fl. 14th century), poet
- LLYWELYN DDU O FÔN - see LLYWELYN ap CYNFRIG DDU O FÔN
- LLYWELYN EIN LLYW OLAF - see LLYWELYN ap GRUFFYDD
- LLYWELYN FARDD (fl. c. 1150-1175), poet
- LLYWELYN FAWR (fl. early 13th century), lords of Merioneth
- LLYWELYN FAWR - see LLYWELYN ap IORWERTH
- LLYWELYN (fl. early 13th century) - see LLYWELYN FAWR
- LLYWELYN FYCHAN ap LLYWELYN ab OWAIN FYCHAN (d. c. 1277), lord of Mechain
- LLYWELYN GOCH ap MEURIG HEN (fl. c. 1360-1390), poet
- LLYWELYN GOCH Y DANT (fl. 1470-1471), bard
- LLYWELYN - see LLYWELYN ap SEISYLL
- LLYWELYN - see LLYWELYN ap IORWERTH
- LLYWELYN (d. 1282) - see LLYWELYN ap GRUFFYDD
- LLYWELYN SION (fl. second half of the 16th century), poet, farmer, at one time beadle or crier in the courts, a professional copyist by trade, and one of the most important figures in the literary life of Glamorganshire
- LLYWELYN Y GLYN - see LEWIS GLYN COTHI
- LLYWELYN, TOMAS (fl. c. 1580-1610), bard and gentleman
- LLYWELYN-WILLIAMS, ALUN (1913 - 1988), poet and literary critic
- LOCKLEY, RONALD MATHIAS (1903 - 2000), farmer, naturalist, conservationist and author
- LORT family Stackpole,
- LOUGHER, Sir LEWIS (1871 - 1955), industrialist and politician
- LOUGHER, ROBERT (d. 1585?), civil lawyer and ecclesiastical administrator
- LOVE, CHRISTOPHER (1618 - 1651), Presbyterian minister
- LOVEGROVE, EDWIN WILLIAM (1868 - 1956), schoolmaster and an authority on Gothic architecture
- LOVELAND, KENNETH (1915 - 1998), journalist and music critic
- LOWE, RICHARD (1810 - 1853), weaver and musician